Experienced professional needed to fix Rover? (3)

I believe the answer is:

vet

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'experienced' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for vet that I've seen before include "solider once" , "Dog doc?" , "'Animal doctor, in short (3)'" , "Screen" , "Experienced" .)

I've seen this clue in The Independent.

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